Connection
Queue

Total Connections Queued: Total connections queued is the total
number of times a connection has been queued. This includes newly accepted
connections and connections from the keep-alive system.

Average
Queuing Delay: Average queueing delay is the average amount of time a connection
spends in the connection queue. This represents the delay between when a request
connection is accepted by the server, and a request processing thread (also
known as a session) begins servicing the request.